The cooling tank liquefies the ammonia, which can be removed into pressurised storage vessels. Stage five The unreacted hydrogen and nitrogen gases are recycled by being fed back through pipes to ...

Ammonia, NH 3, is an alkaline gas and so turns damp red litmus paper blue. Ammonium ions (NH 4 +) – found in ammonium compounds such as ammonium chloride, ammonium nitrate and ammonium sulfate ...